FT: Re-set PTK on reassociation

It turns out that this is needed for both FT-over-DS and FT-over-air
when using mac80211, so it looks easiest to just unconditionally
re-configure the keys after reassociation when FT is used.

src/ap/wpa_auth.c

@@ -1208,11 +1208,10 @@ int wpa_auth_sm_event(struct wpa_state_machine *sm, wpa_event event)
 		break;
 	case WPA_ASSOC_FT:
 #ifdef CONFIG_IEEE80211R
-		if (!sm->pairwise_set || sm->ft_over_ds) {
 		wpa_printf(MSG_DEBUG, "FT: Retry PTK configuration "
 			   "after association");
 		wpa_ft_install_ptk(sm);
-		}
+
 		/* Using FT protocol, not WPA auth state machine */
 		sm->ft_completed = 1;
 		return 0;

src/ap/wpa_auth_ft.c

@@ -1227,7 +1227,6 @@ static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth,
 			   "RRB Request");
 		return -1;
 	}
-	sm->ft_over_ds = 1;
 
 	wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len);
 

src/ap/wpa_auth_i.h

@@ -116,7 +116,6 @@ struct wpa_state_machine {
 					   * Request */
 	u8 r0kh_id[FT_R0KH_ID_MAX_LEN]; /* R0KH-ID from FT Auth Request */
 	size_t r0kh_id_len;
-	int ft_over_ds;
 #endif /* CONFIG_IEEE80211R */
 };